70results about How to "To achieve the purpose of vibration reduction and noise reduction" patented technology

The invention discloses a constant-temperature low-noise oil sump of an engine. The main body of the oil sump is designed as the double-layer sandwich structure. The internal layer is made from the common steel plate while the external layer is made from the composite damping steel plate. The bottom of the main body of the oil sump is provided with an inlet pipe of cooling liquid and an electromagnetic valve. The upper end of the main body of the oil sump is provided with an outlet of cooling liquid while the lower end thereof is provided with a temperature sensor. Transmission lines are connected between the temperature sensor and the electromagnetic valve which are connected with a controller. The bottom of the main body of the oil sump is provided with a lubricant discharging outlet. The external side of the main body of the oil sump is pasted with damping rubber. The oil sump is characterized in that: the shell of the oil sump is modeled by the stamping of double-layer vibration-decreasing steel plates; the temperature of the oil sump shell is maintained within a certain range by the circulation of the cooling liquid in the sandwich structure; the damping performance decline of the damping steel plates, caused by the temperature rise of the lubricant of the engine, is eliminated so as to possibly increase noises; therefore the noise-reducing design is considered for the oil sump structure so as to achieve the purposes of decreasing vibration and reducing noise of the oil sump.

The invention relates to a three-dimensional gradient periodic structure plate with multiple band gap characteristics. The three-dimensional gradient periodic structure plate comprises a multi-layer solid plate base body, and m rows and n columns of short scatterer columns which are arranged to be raised in each layer of plate according to periodicity or quasi-periodicity. Therefore, a plurality of groups of periodic structure plates with short columns are stacked to form the three-dimensional periodic structure plate. The radius or the side length of the raised short columns on the same layerof the plates can be unchanged or can be gradually changed in the row or column direction according to a certain function rule. In the height direction, the height, radius or side length of each layer of raised short columns is gradually reduced or increased according to a certain function rule to form the three-dimensional gradient periodic structure plate. Each layer of the periodic structure plate has a respective band gap characteristic. That means, elastic waves or sound waves in certain frequencies are significantly suppressed when propagating in the plate. The periodic structure can realize the integrated design of the structure and the vibration isolation system. The structure plate has the advantages of light weight, wide vibration isolation frequency, high reliability and the like. The structure plate has a wide application prospect in the field of engineering vibration isolation.

The invention relates to a low-vibration low-noise electromechanical static pressure servo mechanism which comprises a control unit assembly and actuator assemblies, wherein two one-to-two oil ducts of the control unit assembly are respectively connected with two oil ducts of the two actuator assemblies through a hydraulic hose and a self-sealing connector; each actuator assembly comprises two actuators and two displacement sensors, and one displacement sensor is arranged in each actuator; the control unit assembly comprises a servomotor pump, a one-way valve, an isolating valve, a low-pressure pressure sensor, a pressure transducer, a self-pressurization oil tank, a differential pressure transducer, two high-pressure oil ducts and a low-pressure oil duct; and the assemblies are connected into the high-pressure oil duct or low-pressure oil duct. The servo mechanism has the advantages of compact structure, high reliability and favorable sound insulation and sound absorption effects, is convenient for demounting and interchange, and obviously lowers the vibration and noise.

The invention provides a motor and a compressor, wherein the motor comprises a rotor iron core and magnets arranged on the rotor iron core; each magnet is of a circular arc-shaped structure; the circular arc-shaped structure comprises an inner surface and an outer surface which are arranged at intervals; the inner surface is in a first arc surface shape matched with the rotor iron core; and the outer surface comprises an arc surface section in a second arc surface shape and tangent plane sections connected at the two ends of the arc surface section. By using the technical scheme, the magnets are of the circular arc-shaped structures, and the inner surface is in the first arc surface shape matched with the rotor iron core, so that the inner surface can be better attached to the rotor iron core; the air gap uniformity of a motor is ensured; and the performance of the motor is further ensured. Meanwhile, the outer surface also comprises the tangent plane sections connected at the two ends of the arc surface section; through the tangent plane sections, manufacturing materials of the magnets can be reduced; the air gap harmonic wave content is reduced; the goals of reducing vibration and lowering the noise can be achieved; and the problem of sinusoidal air gap flux density can be solved.

The invention relates to a motor with irregular tooth crests for reducing radial electromagnetic exciting force. The structure of the motor is the same as that of the motor in the prior art. The motor is characterized in that a plurality of teeth with irregular tooth crests are arranged on a stator core or a rotor core, or are simultaneously arranged on the stator core and the rotor core, the tooth crests of the teeth consist of a plurality of small teeth, each small tooth adopts a zigzag-shaped, ladder-shaped, semicircle-shaped, semi-elliptic-shaped, or wave-shaped structure. As long as the perimeters of the tooth crests are increased, the radial force is changed into the component force of the normal force, and the action for reducing the radial electromagnetic exciting force can be exerted. When the tooth crests of the teeth adopt the zigzag-shaped structures, the structures with one-way zigzags can be adopted, the structures with two-way zigzags can also be adopted, and included angles between the bevel edges and the radial edges of the zigzag-shaped structures can be selected according to requirements. The motor disclosed by the invention can be widely applied to various motors, such as permanent magnet motors, asynchronous motors, electro-magnetic synchronous motors, switch reluctance motors and the like.

The invention discloses an automotive acoustic superstructure for low-frequency broadband vibration reduction. The superstructure comprises at least two superstructure base plates; each superstructure base plate comprises at least one unit cell unit; each unit cell unit comprises a unit cell frame, a first mounting plate, a second mounting plate and a mass block body, the first mounting plate and the second mounting plate are respectively arranged at the left part and the right part of the unit cell frame from left to right, and the mass block body is detachably fixed to the first mounting plate and the second mounting plate. The automotive acoustic superstructure for low-frequency broadband vibration reduction is simple in structure, the band gap frequency range of the acoustic superstructure is widened, the total elastic wave energy dissipation amount of superstructure unit cells is greatly increased, it is guaranteed that vibration elastic waves transmitted from all directions can be well restrained, and the automotive acoustic superstructure is high in applicability and wide in application field.

The invention discloses a high-damping dual-frequency power damping gear transmission device. The high-damping dual-frequency power damping gear transmission device comprises an engagement frequency damping mechanism and a shaft driving rotating frequency damping mechanism. The engagement frequency damping mechanism comprises first compression springs, a guide rod and a mass block. The guide rod is sleeved with the mass block. The two ends of the guide rod are fixed to a pair of support frames. The first compression springs are arranged between the mass block and the support frames. The shaftdriving rotating frequency vibration damping mechanism comprises the mass block, a bearing and second compression springs. The outer side of the bearing is sleeved with the mass block. An inner ring of the bearing is mounted on a bearing mounting sleeve of a base. Upper compression spring seats and lower compression spring seats are arranged on the inner side of the mass block. Middle compressionspring seats are arranged between the upper compression spring seats and the lower compression spring seats. The second compression springs are arranged between the middle compression spring seats andthe upper compression spring seats and between the middle compression spring seats and the lower compression spring seats. By the adoption of the high-damping dual-frequency power damping gear transmission device, under the rated operating condition of a system, the problems of medium-high-frequency vibration and noise caused by the gear engagement vibration and shaft rotation vibration in the gear transmission system can be remarkably reduced.

The invention provides an acoustic shield based on acoustic wave band gap features of generalized photonic crystal semi-cylinder shells. The acoustic shield based on the acoustic wave band gap features of the generalized photonic crystal semi-cylinder shells comprises a shield body. The shield body is a square shell formed by connecting five base boards. The bottom end of the shield body is provided with a bottom edge connecting plate. The bottom edge connecting plate is provided with a threaded hole. The shield body is connected with a base through the bottom edge connecting plate. The inner surface of each base board is evenly provided with at least two semi-cylinder grooves. Each semi-cylinder groove is provided with the generalized photonic crystal semi-cylinder shell. Each generalized photonic crystal semi-cylinder shell is provided with at least two period components from inside to outside. Each period unit is composed of a non-metal layer and a metal layer from inside to outside in sequence, and each non-metal layer and the corresponding metal layer are attached to each other. Every two adjacent period components are attached to each other. The acoustic shield has the advantages of being large in sound insulation factor, convenient to assemble, disassemble and transport, low in design and manufacturing cost and the like. The acoustic shield has good damping and noise reduction effect on vibration within a band gap range.

The invention provides a transmission device for an automobile seat adjustor. The transmission device for the automobile seat adjustor comprises a screw rod, a worm wheel, a worm, an output bearing, an input bearing and a housing, wherein the worm wheel is arranged on the screw rod in a sleeving way; the worm rod drives the worm wheel to rotate; the output bearing is arranged at the two ends of the worm wheel; the input bearing is arranged at the two ends of the worm; the housing is used for fixing and bearing the input bearing and the output bearing. The worm wheel is provided with an internal thread matched with the screw rod, so that the worm wheel can perform reciprocating motion along the screw rod during rotation. The transmission device also comprises a guide bearing which is arranged at the periphery of the screw rod in a sleeving way and fixed with the housing; the guide bearing, the output bearing and the worm wheel are arranged at intervals in the axial direction. Due to the adoption of the transmission device, friction vibration between the guide bearing and the screw rod is prevented from being transmitted to the worm wheel, so that inclined cooperation of the worm wheel and the screw rod, noise generation and abrasion enhancement are avoided; the structure strength of the guide bearing can be improved, and corresponding forming materials are convenient to select to meet the supporting requirement of the worm wheel and the guide requirement of the screw rod respectively.

The invention discloses a pressurizing pump, a water purifier applying the pressurizing pump, and a water heater applying the pressurizing pump. The pressurizing pump comprises a pump body and a vibration reducing and noise lowering structure; the vibration reducing and noise lowering structure comprises at least one shell; each shell at least comprises a first vibration reducing and noise lowering layer, a middle layer arranged on the first vibration reducing and noise lowering layer in a sleeving manner, and a second vibration reducing and noise lowering layer arranged on the middle layer ina sleeving manner; and the first vibration reducing and noise lowering layer, the middle layer and the second vibration reducing and noise lowering layer jointly wrap the pump body. The technical scheme solves the noise problem, caused by the pressurizing pump, of an existing household appliance, and influences of vibration of the pressurizing pump on the household appliance are eliminated.

The invention relates to a straight shaft plunger pump, in particular to a straight shaft plunger pump with a limiting arc-shaped slide rail balance. The straight shaft plunger pump comprises a pump body, a cylinder body, a plunger, a balance, two planar arc-shaped slide rails and a balance angle adjusting device, wherein the bottom of the balance is provided with two slide tracks; the two planerarc-shaped slide rails are arranged at the bottom of the pump body in a sliding mode with the slide tracks of the balance, and are used for supporting the balance; and the slide rails on at least oneside are transverse limiting arc-shaped slide rails and the slide tracks on the balance are transverse limiting arc-shaped slide tracks. The transverse limiting arc-shaped slide rails and slide tracks increase the side force of a contact surface, reduce the transverse play of the balance, improve the stress state of the balance, improve the smoothness of a rotor, lighten vibration and fulfill theaim of reducing noises of the whole pump. Besides, the assembly of the whole pump is more simplified, and the assembly accuracy is also improved.

The invention provides a sound insulation, vibration reduction and noise suppression multifunctional integrated metamaterial plate shell structure and a preparation method thereof. The sound insulation, vibration reduction and noise suppression multifunctional integrated metamaterial plate shell structure comprises an integrated metamaterial plate shell module and a matrix stiffened plate shell, and the integrated metamaterial plate shell module comprises a first bending vibration part, a coupling part, a second bending vibration part and an acoustic decoupling part; the acoustic decoupling part is located between the first bending vibration part and the second bending vibration part, and the edge of the first bending vibration part and the edge of the second bending vibration part are connected to the coupling part; and the first bending vibration part comprises a first substrate plate shell and a plurality of first resonance units arranged on the first substrate plate shell, and the second bending vibration part comprises a second substrate plate shell and a plurality of second resonance units arranged on the second substrate plate shell. The structure achieves the integrated design of the low-frequency sound insulation function and the low-frequency vibration reduction function, meanwhile, the development time from design to application is shortened, and space is saved.

The invention provides a turbine box which is used for a breathing machine and comprises an upper cap, a lower cover and a lower cap sequentially fixed arranged detachably. An air channel frame is arranged at a joint of the lower cap and the lower cover, turbine box air incoming holes are formed in the air channel frame and the lower cap corresponding to the air channel frame, and a first cyclone channel communicated with the turbine box air incoming holes and a second cyclone channel communicated with the first cyclone channel are arranged in the air channel frame; a turbine air inlet is arranged on the air channel frame and in the middle of the same and communicated with the second cyclone channel. By to the structure, gas rotates in the turbine box by a circle and enters a turbine through an air channel, circulation distance of the gas inside the turbine box is prolonged greatly, smoothness of gas circulation is guaranteed, outward diffusion of turbine noise through the air channel is reduced effectively, and noise of the turbine during working is lower. On the other side, the invention further provides the breathing machine with the turbine box.

The invention relates to a density-adjustable multilayer periodic structure. The periodic structure comprises a central thin film or a central plate base body layer (1), embedded block bodies (2) andouter side thin films or outer side plate base body layers (3), wherein the central thin film or the central plate base body layer (1) is positioned in the middle layer, the outer side thin films or the outer side plate base body layers (3) are arranged on the two sides of the central thin film or the central plate base body layer (1), the embedded block bodies (2) which are overally arranged in aperiodical mode are uniformly arranged in the outer side thin films or the outer side plate base body layers (3), so that the multilayer periodic structure is formed through stacking based on the above mode. The multilayer periodic structure is fixed on a frame with a large rigidity to be subjected to pre-stretching, the density of the periodic structure can be adjusted, so that the physical parameters of the periodic structure are changed, and the active control over periodic structure band gaps is realized; and the structure can be applied to the field of vibration reduction and vibration isolation, compared with a traditional active and passive vibration isolation structure, the periodic structure has the advantages of light weight, wide vibration isolation frequency, high reliabilityand the like, and meanwhile, the structure can be used for actively controlling the band gap range.

The invention discloses a buffering device for limiting and belongs to the technical field of safety protection. The buffering device comprises a limiting base, a first fastening plate, a ball bearing, a limiting guide rod, an elastic support component, a cover plate, a first sleeve, a second fastening plate and a vibration isolation panel, wherein the first fastening plate is arranged right abovethe limiting base; the ball bearing is arranged in the middle of the top of the limiting base; one end of the limiting guide rod is semi-spherical; the other end of the limiting guide rod is connected with the limiting base through the elastic supporting component; a limiting distance is kept between the cover plate and the first fastening plate; two axial ends of the first sleeve are opened; thesecond fastening plate and the cover plate are respectively arranged at the two axial ends of the first sleeve to form a sealed cavity; and the vibration isolation panel comprises a carbon fiber bearing layer and a vibration isolation interlayer, so that a vibration isolation device can adapt to different working conditions when the limiting rigidity of the vibration isolation device is not changed. The reliability and the working efficiency of the buffering device are improved. The limiting guide can be protected.

The invention relates to a supercell capable of forming a composite structure with multiple band gap periods. The supercell comprises a substrate (1) and scatterer oscillators (2) periodically arranged on the substrate. The scatterer oscillators (2) are divided into embedded oscillators (2-1) and convex oscillators (2-2). And the convex vibrators (2-2) are divided into convex vibrators A (2-2-1) and convex vibrators B (2-2-2). The periodic composite structure formed by the supercell elements has multiple band gaps, and can play a role in inhibiting propagation of elastic waves or sound waves in multiple frequency ranges. Therefore, the integrated design of the structure and the vibration isolation system is achieved, and the supercell has the advantages of being light in weight, wide in vibration isolation frequency, high in reliability and the like and has wide application prospects in the engineering vibration isolation field.

The invention relates to a self-adaptive power vibration reduction gear. The gear comprises a gear body, a plurality of vibration reduction modules are embedded in the gear body, each vibration reduction module comprises a vibration reduction mass block, a centrifugal mass block, an upper spring and a lower spring, mounting grooves are formed in the gear body, the vibration reduction mass blocks are fixed in the mounting grooves, connecting rods are further fixed to one sides of the vibration reduction mass blocks, the other ends of the connecting rods are fixed in the mounting grooves, the centrifugal mass blocks slide on the connecting rods, the upper springs and the lower springs are arranged on two sides of the centrifugal mass blocks respectively, the connecting rods are connected to the upper springs and the lower springs in a sleeving mode, one ends of the upper springs abut against the vibration reduction mass blocks, the other ends of the upper springs abut against the centrifugal mass blocks, one ends of the lower springs abut against the centrifugal mass blocks, and the other ends abut against the bottoms of the mounting grooves. According to the gear, in the power transmission process of the gear body, the purpose of self-adaptive vibration and noise reduction can be achieved within a certain rotating speed range, the rotating speed is not limited to a certain fixed rotating speed any more, and the purpose of vibration and noise reduction is achieved under the condition that the appearance and the space size of the gear are not increased.

A damping device of a shuttle tanker comfort superstructure and a manufacturing method are disclosed. The damping device comprises transverse toggle plate type plate frames, the transverse toggle plate type plate frames are welded and fixed to a left board and a right board of a front bulkhead and a rear bulkhead of a superstructure, and a plurality of horizontal cross beams and reinforcing ribs are welded to the transverse toggle plate type plate frames. The method comprises the steps that the transverse toggle plate type plate frames are positioned on a jig frame according to a drawing, and the positioning size of the reinforcing ribs and the position of the horizontal cross beam are marked on the transverse toggle plate type plate frames; the horizontal cross beam is welded to the transverse toggle plate type plate frames according to a scribing position; the reinforcing ribs are welded to the transverse toggle plate type plate frames, and the ends of the reinforcing ribs are directly welded to the horizontal cross beam; and after the damping device is integrally welded, the damping device is integrally hoisted and welded to the front and rear bulkheads of the superstructure. The damping device is simple and reasonable in design, remarkable in damping effect and capable of effectively reducing superstructure vibration power transmission so that the purposes of damping and noise reduction are achieved, meanwhile, the stability of a hull structure is ensured, and the comfort level of personnel is improved.

The invention relates to the technical field of track transit vibration isolation, and discloses a track vibration damping device including a vibration damping unit mounted between two adjacent fasteners of the track. The vibration damping unit comprises an outer box body which is connected with the track waist of the track and a mass body accommodated in the outer box body, and the gap between the outer box body and the mass body is filled with a damping liquid. The track vibration damping device provided by the invention is characterized in that a vibration damping unit is arranged on the track waist of the track, the vibration damping unit includes an outer case and a mass body accommodated in the outer case, so as to resize the mass, so that the characteristic frequency of the track vibration damping device is matched with the characteristic frequency of the track, so as to reduce the vibration of the track, reduce the noise radiated from the track, and make the internal mass vibrate through the damping liquid filled between the outer box body and the mass body. The damping liquid acts as the dissipation body of energy to consume the vibration energy of the track, so as to adjust the characteristic frequency of the track and reduce the vibration of the track.